PBDB Taxon

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Hyracotheriinae

Mammalia - Perissodactyla - Equidae

Taxonomy

Hyracotheriinae was named by Cope (1881). It was considered paraphyletic by MacFadden (1998).

It was assigned to Lophiodontidae by Cope (1881); to Hyracotheriidae by Lucas and Kondrashov (2004); and to Equidae by Hay (1902), Gidley (1907), Peterson (1919), McGrew (1953), MacFadden (1998) and Franzen (2006).

Subtaxa

Haplohippus

Synonymy list

Year	Name and author
1881	Hyracotheriinae Cope p. 381
1902	Hyracotheriinae Hay p. 608
1907	Hyracotheriinae Gidley p. 867
1919	Hyracotheriinae Peterson p. 101
1953	Hyracotheriinae McGrew p. 167
1998	Hyracotheriinae MacFadden p. 542
2004	Hyracotheriinae Lucas and Kondrashov p. 217
2006	Hyracotheriinae Franzen

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
subclass	Synapsida
—	Therapsida	()
infraorder	Cynodontia	()
—	Mammaliamorpha
—	Mammaliaformes

Rank	Name	Author
class	Mammalia
—	Theriamorpha	(Rowe 1993)
—	Theriiformes	()
—	Trechnotheria
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Laurasiatheria
—	Scrotifera
—	Euungulata
—	Panperissodactyla
superorder	Perissodactylamorpha
order	Perissodactyla	()
superfamily	Equoidea
family	Equidae
subfamily	Hyracotheriinae
subfamily	Hyracotheriinae

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Subfm. †Hyracotheriinae Cope 1881

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G. †Haplohippus McGrew 1953

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†Haplohippus texanus McGrew 1953

Diagnosis

Reference	Diagnosis
J. W. Gidley 1907	Teeth brachyodont; molariform premolars not more thantwo; digitformula4-3; rudimentaryfifthdigiton hindfot; 1stdigitoffore footnotrepresentedinknownforms. Orbitnotclosedbehind.